Hussmann microSC MDN-BA User manual

MDN-BA/SA
Medium Temperature Self Contained
Open Vertical Merchandiser
with R-290 Refrigerant
Installation &
Operation Manual
P/N 9FQ-6-P110-075-00_B
April 2021
Spanish 9FQ-6-P110-077-00
®
Æ
WARNINGS:
If the information in these instructions are not followed
exactly, a fire or explosion may result, causing property
damage, personal injury or death.
Installation and service must be performed by a qualified
installer or service agency.
READ THE ENTIRE MANUAL BEFORE
INSTALLING OR USING THIS EQUIPMENT.
The unit uses R-290 gas as the refrigerant. R-290 is
flammable and heavier than air. It collects first in low
areas but can be circulated by the fans. If propane gas
is present or even suspected, do not allow untrained
personnel to attempt to find the cause. The propane
gas used in the unit has no odor.The lack of smell does
not indicate a lack of escaped gas. If a leak is detected,
immediately evacuate all persons from the store, and
contact the local fire department to advise them that
a propane leak has occurred. Do not let any persons
back into the store until the qualified service technician
has arrived and that technician advises that it is safe to
return to the store. No open flames, cigarettes or other
possible sources of ignition should be used inside or in
the vicinity of the units.
FAILURETOABIDE BYTHIS WARNING COULD
RESULT IN AN EXPLOSION, DEATH, INJURYAND
PROPERTY DAMAGE.
IMPORTANT
Keep in store for future reference!
I/O MANUAL MDN R-290

BEFORE YOU BEGIN
Read these instructions completely and carefully.
PERSONAL PROTECTION EQUIPMENT (PPE)
Personal Protection Equipment (PPE) is required whenever installing or servicing this
equipment. Always wear safety glasses, gloves, protective boots or shoes, long pants, and
a long-sleeve shirt as required when installing or servicing this equipment.
1. If the information in these instructions are not followed exactly, a fire or explosion may result, causing property damage, personal injury
or death.
2. Installation and service must be performed by a qualified installer or service agency.
3. This unit is designed only for use with R-290 gas as the designated refrigerant.
THE REFRIGERANT LOOP IS SEALED. ONLY A QUALIFIED TECHNICIAN SHOULD ATTEMPT TO SERVICE!
• Propane is flammable and heavier than air.
• It collects first in the low areas but can be circulated by the fans.
• If R-290 is present or even suspected, do not allow untrained personnel to attempt to find the cause.
• The propane gas used in the unit has no odor.
• The lack of smell does not indicate a lack of escaped gas.
• If a leak is detected, immediately evacuate all persons from the store, and contact the local fire department to advise them that a
pro pane leak has occurred.
• Do not let any persons back into the store until the qualified service technician has arrived and that technician advises that it is
safe to return to the store.
• A hand-held propane leak detector (“sniffer”) shall be used before any repair and/or maintenance.
• No open flames, cigarettes or other possible sources of ignition should be used inside the building where the units are located
until the qualified service technician and/or local fire department determines that all propane has been cleared from the area and
from the refrigeration systems.
• Component parts are designed for propane and non-incendive and non-sparking. Component parts shall only be replaced with
identical repair parts.
FAILURE TOABIDE BY THIS WARNING COULD RESULT IN AN EXPLOSION, DEATH, INJURY AND PROPERTY DAMAGE.
P/N 9FQ-6-P110-075-00_A ii

P/N 9FQ-6-P110-075-00_Biii
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
Merchandiser must operate for 24 hours
before loading product!
Regularly check merchandiser temperatures.
Do not break the cold chain. Keep products
in freezer before loading into merchandiser.
These merchandisers are designed
for only pre-frozen products.
AT TENTION
Merchandiser must operate for 24 hours
before loading product!
Regularly check merchandiser temperatures.
Do not break the cold chain. Keep products in
cooler before loading into merchandiser.
These merchandisers are designed
for only pre-chilled products.

TABLE OF CONTENTS iv
IMPORTANT
KEEP IN STORE FOR FUTURE REFERENCE
Quality that sets industry standards!
12999 St. Charles Rock Road • Bridgeton, MO 63044-2483
U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900
www.hussmann.com
© 2021 Hussmann Corporation
ANSI Z535.5 DEFINITIONS .............. v
INSTALLATION
UL Listing ............................ 1-1
Federal / State Regulation ............... 1-1
Hussmann Product Control .............. 1-1
Shipping Damage ...................... 1-1
Apparent Loss Or Damage .............. 1-1
Concealed Loss Or Damage ............. 1-1
Location .............................. 1-1
Part Names ........................... 1-3
Additional Parts ....................... 1-4
Model Description ..................... 1-5
Unloading ............................ 1-5
Unloading from Trailer ......................... 1-5
Serial Plate Location .................... 1-5
Exterior Loading ....................... 1-5
Shipping Skid ......................... 1-5
Thermometer .......................... 1-5
Equipment Start Up Check List ........... 1-6
ELECTRICAL / REFRIGERATION
Merchandiser Electrical Data ............. 2-1
Field Wiring ........................... 2-1
Electrical Connections . . . . . . . . . . . . . . . . . . . 2-1
Electrical Outlet ........................ 2-1
Power Switch .......................... 2-1
Refrigeration (Self Contained Models) ..... 2-2
Waste Outlet and Water Seal ............. 2-2
Controls and Adjustments ................ 2-3
Controller Operation .................... 2-4
Controller Connections .................. 2-5
Controller Buttons ..................... 2-6
Setpoint............................... 2-7
Shelves ............................... 2-8
Stocking .............................. 2-8
Drain Water ........................... 2-8
Service Safety ......................... 2-10
Replacing Refrigeration
System Componets .....................2-11
Steps to Recover Refrigerant ............ 2-11
Charging ............................ 2-11
Waste Outlet and Water Seal ............ 2-12
MAINTENANCE
Care and Cleaning ...................... 3-1
Exterior Surfaces ................................3-1
Interior Surfaces ................................3-1
Do NOT Use: ...........................3-1
Do Use:................................3-1
Removing Scratches from Bumper ......... 3-1
Warnings...............................3-2
Cleaning Steel Surfaces ...................3-4
Cleaning Condenser Coils ................ 3-4
Cleaning Honeycomb.................... 3-5
Cleaning Power Plug .................... 3-6
Cleaning Drain Evaporation System ....... 3-6
Changing Moisture Wicking Plates ........ 3-6
Night Curtain ......................... 3-8
SERVICE
“In Case of the Following” ............... 4-1
Troubleshooting ....................... 4-2
Direct Drain .......................... 4-3
Replacement Parts List .................. 4-6
WARRANTY

P/N 9FQ-6-P110-075-00_Bv
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
REVISION HISTORY
REVISION B — ADDED PAGE 4-6
ORIGINAL ISSUE — 2021
Excessive ambient conditions may cause conden-
sation and therefore sweating of doors. Facility oper-
ators should monitor doors and floor conditions to
ensure safety of persons.
All installation and operating instructions con-
cerning the handling, moving, and use of these
merchandisers must be carefully followed to avoid
either damaging the refrigerant tubing, or increas-
ing the risk of a leak.
Case ventilation openings must be clear of any
obstructions. Do not damage the refrigerant circuit.
Always disconnect the electrical power at the
main disconnect when servicing or replacing any
electrical component. This includes, but is not
limited to, such items as fans, heaters, thermostats
and lights.
Do not use mechanical devices or other means to
accelerate the defrosting process.
Do not use electrical appliances inside the food
storage compartments of the case.
This warning does not mean that Hussmann products
will cause cancer or reproductive harm, or is in
violation of any product-safety standards or
requirements. As clarified by the California State
government, Proposition 65 can be considered more of
a‘right to know’ law than a pure product safetylaw.
When used as designed, Hussmann believes that our
products are notharmful. We provide the Proposition
65 warning to stay in compliance with California State
law. It is your responsibility to provide accurate
Proposition 65 warning labels to your customers when
necessary. For more information on Proposition 65,
please visit the California State government website.
August 31, 2018
ANSI Z535.5 DEFINITIONS
• DANGER – Indicate[s] a hazardous
situation which, if not avoided, will
result in death or serious injury.
• WARNING – Indicate[s] a
hazardous situation which, if not
avoided, could result in death or
serious injury.
• CAUTION – Indicate[s] a
hazardous situation which, if not
avoided, could result in minor or
moderate injury.
• NOTICE – Not related to personal
injury – Indicates[s] situations, which
if not avoided, could result in damage
to equipment.
!
!
!
The safety of our customers and employees is paramount.
The precautions and procedures described in this manual
are intended as general methods for safe use of
this equipment. Please be sure to comply with the
precautions described in this manual to protect you
and others from possible harm, and follow OSHA
standards for safety.
The definitions at right are used to clarify the
magnitude and urgency of harm and damage,
considering problems arising from misuse. Relative
to their potential danger, the definitions are
divided into four parts according to
ANSI Z535 Series.

P/N 9FQ-6-P110-075-00_B1-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
UL LISTING
These merchandisers are manufactured to meet
ANSI/ UL 471 standard requirements for safety.
Proper installation is required to maintain the
listing.
FEDERAL / STATE REGULATION
These merchandisers at the time they are man-
ufactured, meet all federal and state/ provincial
regulations. Proper installation is required to
ensure these standards are maintained. Near
the serial plate, each merchandiser carries a
label identifying the environment for which the
merchandiser was designed for use. This model
is Type II as described below.
ANSI/NSF-7 Type II – Display Refrigerator / Freezer
Intended for 80°F / 55%RH Ambient Application
ANSI/NSF-7 – Display Refrigerator
Intended for Bulk Produce
HUSSMANN PRODUCT CONTROL
The serial number and shipping date of all
equipment is recorded in Hussmann’s files
for warranty and replacement part purposes.
All correspondence pertaining to warranty or
parts ordering must include the serial number
of each piece of equipment involved. This is to
ensure the customer is provided with the correct
parts.
SHIPPING DAMAGE
All equipment should be thoroughly examined for
shipping damage before and during unloading.
This equipment has been carefully inspected at
our factory.
Any claim for loss or damage must be made to
the carrier. The carrier will provide any necessary
inspection reports and/or claim forms.
Apparent Loss or Damage
If there is an obvious loss or damage, it must
be noted on the freight bill or express receipt
and signed by the carrier’s agent; otherwise,
carrier may refuse claim.
Concealed Loss or Damage
When loss or damage is not apparent until
after equipment is uncrated, retain all packing
materials and submit a written response to the
carrier for inspection within 15 days.
LOCATION
These merchandisers are designed for
displaying products in air conditioned stores
where temperature is maintained at or below
the ANSI / NSF-7 specified level and relative
humidity is maintained at or below 55%.
Placing refrigerated merchandisers in direct
sunlight, near hot tables or near other heat
sources could impair their efficiency. Like
other merchandisers, these merchandisers are
sensitive to air disturbances. Air currents
passing around merchandisers will seriously
impair their operation. Do NOT allow air
conditioning, electric fans, open doors or
windows, etc. to create air currents around the
merchandiser.
INSTALLATION
Recommended operating ambient
temperature is between
60°F (16°C) to 80°F (27°C).
Maximum relative humidity is 55%.
Do NOT stand or walk on top of
merchandiser. Do not store items or
ammable materials atop the unit.

1-2 INSTALLATION
P/N 9FQ-6-P110-075-00_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
LOCATION (Continued)
Product should always be maintained at proper
temperature. This means that from the time
the product is received, through storage,
preparation and display, the temperature of the
product must be controlled to maximize the life
of the product.
be sure to position self contained
merchandisers properly.
SELF CONTAINED models have vented base
panels to allow air circulation through the
condensing unit.
Allow for a minimum of 2 inches of clearance
from walls, merchandisers, and any other large
objects near the merchandiser’s vented base
panels. A minimum space of 2 inches should
be left above the case. Blocking or restricting
air flow will adversely affect performance and
may damage the refrigeration system.
If the merchandiser is used or stored in a hot
spring or coastal area, it may be damaged (due
to sulfur or salt). If the intention is to install
the merchandiser in any of the above areas or
locations, contact the supplier or dealer where
you purchased the merchandiser. Do not lay
the case sideways to move the case. This may
cause damage. Case should be installed on a
flat, level floor.
After installation, fix the case in place with the
leveling legs (case option) to make sure that it
does not move. Or if the case has casters, lock
the casters.
Do not store items or ammable
materials atop the unit.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
Leveling Legs or Casters
Ground wire
Air inlet
Do not block this inlet
or the merchandiser
will not cool properly
2-inch
Air Exhaust
Clearance
from Wall
(Optional)
Hanging
Wall
Floor
2-inch gap
required
(51 mm)
2-inch gap
required
(51 mm)
Wall

P/N 9FQ-6-P110-075-00_B1-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
Part names
Electrical controls box
Bracket
Shelf
The slots that hold the left
and right shelf brackets are
located at 0.59 inch intervals.
The shelf position can thus
be adjusted to match the
size of the product stored.
Model MDN4775BA/SA shown
Tag molding
Deck pan
Front panel
Hussmann logo
Lamp switch
Controller
Main Switch
Overow drain pan
RTN400 Page 17/130
KDEPLUS BUTTONS
The KDEPlus keyboard has 4 keys, as shown in the illustration:
1
2
3
4
Each key has a different function depending on whether it is:
• Pressed and released
• Pressed for at least 5 seconds
• Pressed and held at start-up
• Pressed in combination with another key.
KEYS
The following table summarizes the function of each key:
No Key Action
Pressed and released Press for at least 5 secs Start-up
1• Scrolls through menu items
• Decreases values
Activates the Manual Defrost function
(from outside menus). ---
2• Scrolls through menu items
• Decreases values
Function can be configured by the user
(from outside menus).
(see parameter H32)
---
3
• Returns to the previous menu
level
• Confirms parameter value
Activates the Stand-by function
(from outside menus). ---
4set
• Displays any alarms
(if active)
• Opens Machine Status menu
• Confirms commands
Opens the Programming Menu
(User and Installer parameters)
When pressed during
start-up it enables
the user to select the
application to be loaded.
STANDBY or ESC
DOWN SET
UP

1-4 INSTALLATION
P/N 9FQ-6-P110-075-00_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
Part names
Additional parts
Model MDN4775BA/SA~ shown
Night Curtain
(Optional)
LED lamp
Honeycomb
The honeycomb adjusts
the air ow.
Discharge air outlet
Do not block this outlet with
product, or the merchandiser
will not cool properly.
Return air inlet
Do not block this inlet with
product, or the merchandiser
will not cool properly.
Caster
Condensing unit
Overow drain pan
Night Curtain
hook (Optional)
Handrail
Condenser fan
Evaporator fan
Single-phase
208V
power cord
NEMA L6-20P
Air inlet
Do not block this inlet
or the merchandiser
will not cool properly
Appearance Quantity
1pc
Name
Overow drain pan
Air Outlet

P/N 9FQ-6-P110-075-00_B1-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
MODEL DESCRIPTION
The MDN models are open, vertical, medium
temperature display merchandisers. They are
self contained merchandisers with their own
condensing unit. Each self contained model
has a condensing unit that is factory installed
beneath the display area of the case. The unit
is ready for operation when electrical service
is connected. See Section 2 for electrical
information before starting the case.
UNLOADING
Unloading from Trailer:
Lever Bar (also known as a Mule, Johnson
Bar, J-bar, Lever Dolly, or Pry Lever) Move
the merchandiser as close as possible to its
permanent location and remove all packaging.
Check for damage before discarding packaging.
Remove all separately packed accessories
such as kits and shelves. Improper handling
may cause damage to the merchandiser when
unloading. To avoid damage:
1. Do not drag the merchandiser out of the
trailer. Use a Johnson bar (mule).
2. Use a forklift or dolly to remove the
merchandiser from the trailer.
SERIAL PLATE LOCATION
The serial plate is located at the interior top
left end. It contains all pertinent information
such as model, serial number, amperage rating,
refrigerant type and charge.
EXTERIOR LOADING
Do NOT walk on top of merchandisers or
damage to the merchandisers and serious
personal injury could occur. Merchandisers are
not structurally designed to support excessive
external loading such as the weight of a person.
Do not place heavy objects or flammable
materials on the merchandiser.
SHIPPING SKID
Each merchandiser is shipped on a skid to
protect the merchandiser’s base, and to make
positioning the case easier. Remove the top of
the crate, and detach walls from each other.
Lift crate from the skid. Unscrew the case
from the skid. The fixture can now be lifted
off the crate skid. Lift only at base of skid!
Remove any attached braces and/or skids.
DO NOT TILT MERCHANDISER ON ITS
SIDE OR END WHEN REMOVING SKID.
The case is equipped with casters for ease of
installation and transportation inside store.
Check floor where cases are to be set to see if
it is a level area. Determine the highest part of
the floor.
THERMOMETER
The cabinet has a “pencil” type thermometer
and reads from -40º F to 120º F / -40º F to 50º F
on 2º increments. The thermometer is located
in the packout kit inside of the merchandiser.
It should be placed and left inside the bottom
front interior compartment during normal
operation of the merchandiser.
Serial Plate
Do NOT remove shipping crate until the
merchandiser is positioned for installation.

1-6 INSTALLATION
P/N 9FQ-6-P110-075-00_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
Hussmann Self-Contained Refrigeration Equipment Start Up Check List
***Please note that failure to follow this start-up document may void your factory warranty***
Form HSCW01 Rev. 30MAY12 P/N 0525209_B
Step Startup Activity Check
1 Locate, read and maintain install/operation manual in a safe place for
future reference.
2 Examine unit. Confirm there is NO damage or concealed damage.
3 Level the unit, side to side and front to rear.
4 Remove all shipping brackets/compressor straps/bolts etc.
5 Unit must be run on a dedicated electrical circuit without the use of
an extension cord.
6 Ensure that the proper electrical requirements for the equipment are
supplied.
7 Verify field electrical connections are tight.
8 Verify all electrical wiring is secured and clear of any sharp edges or
hot lines.
9 Verify the condensate drain line is properly trapped and pitched.
10 Verify all required clearances on the sides and back of unit.
11 Verify there are no air disturbances external to the unit. Heat and air
registers, fans, and doors etc.
Advise owner/operator that merchandiser must operate at temperature for 24 hrs prior to loading
with product.
LEGAL DISCLAIMER:
Hussmann shall not be liable for any repair or replacementsmade without the written consent of Hussmann, or when the product is installed or operated in a manner
contrary to the printed instructions covering installation and service which accompanied such product.

P/N 9FQ-6-P110-075-00_B2-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
ELECTRICAL / REFRIGERATION
MERCHANDISER ELECTRICAL DATA
Refer to merchandiser serial plate for electrical
information.
FIELD WIRING
Field wiring must be sized for component
amperes stamped on the serial plate. Actual
ampere draw may be less than specified.
ELECTRICAL CONNECTIONS
All wiring must be in compliance with NEC
and local codes. Self contained models are
electrical cord connected at the electrical box.
Ensure ground pin is attached. For any
questions, contact the supplier or dealer where
you purchased the product or licenced service
provider.
This unit uses a powercord with NEMA (L6-20P)
plug. The powercord is rated for 20A/208-230V.
ELECTRICAL OUTLET:
Before the merchandiser is connected to any
wall circuit, use a voltmeter to check that the
outlet is at 100% of the rated voltage. The wall
circuit must be dedicated for the merchandiser.
Failure to do so voids the warranty. Do not use
an extension cord. Never plug in more than one
merchandiser per electrical circuit.
• Always use a dedicated circuit with the
amperage stated on the unit.
• Plug into an outlet designed for the plug.
• Do not overload the circuit
• Do not use long or thin extension cords.
Never use adapters.
• If in doubt, call an electrician.
Ensure ground pin is attached.
For any questions, contact the supplier or dealer
where you purchased the product or licenced
service provider.
POWER SWITCH
The main ON/OFF switch is located on the
front control on the bottom, righthand-side
of merchandiser. This is not the main power
switch. Power will continue to run through the
case until main plug is unplugged.
ALWAYS CHECK THE SERIAL PLATE FOR
COMPONENT AMPERES
Risk of Electric Shock. If cord or plug
becomes damaged, replace only with
a cord and plug of the same type.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
Merchandiser must be grounded.
Do not remove the power supply cord ground.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE

2-2 ELECTRICAL / REFRIGERATION
P/N 9FQ-6-P110-075-00_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
REFRIGERATION
Each self-contained model is equipped with
its own condensing unit and control panel
located beneath the display area. The correct
type of refrigerant will be stamped on each
merchandiser’s serial plate. The merchan-
diser refrigeration piping is leak tested. The
unit is charged with refrigerant, and shipped
from the factory with all service valves open.
WATER OUTLET AND WATER SEAL
The condensate water outlet is located at the
front of the liner bottom under deck pan. The
outlet has a factory installed, external water
seal.
For self contained models, this water seal
drains into the condensate evaporator pan
located beneath the merchandiser.
NOTE: All lower base panels must be in place
when the refrigerator is operating. If not, air-
flow from the condenser will be directed over
the evaporator pan and defrost water in the
pan may overflow.
Refrigeration lines are under pressure.
Refrigerant must be recovered before
attempting any connection or repair.
When brazing pipes, be sure to use an
insulation blanket (not shipped with the
merchandiser) to prevent damage to the
metal merchandiser bottom.
— LOCK OUT / TAG OUT —
To avoid serious injury or death from electri-
cal shock, always disconnect the electrical
power at the main disconnect when servicing
or replacing any electrical component. This
includes, but is not limited to, such items as
doors, lights, fans, heaters, and thermostats.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
It is the contractor’s responsibility to
install merchandiser(s) in accordance with
all local building and health codes.
...ATTENTION
INSTALLER

P/N 9FQ-6-P110-075-00_B2-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
The controller controls refrigeration temperature. The controller is factory installed in the control
panel mounted on the merchandiser’s fascia.
Discharge air temperatures should be measured at the center of the honeycomb. Defrosts are time
initiated and temperature terminated for these models. The defrost setting is set in the factory.
The product application is factory set for Med. Temp. - NSF7 as shown below.
CONTROLS AND ADJUSTMENTS
Model ProductApplication DischargeAirTemperature(AvgRefmode) ControllerSetPoint(°F) DefrostFrequency(perday) TypeofDefrost Temp.Termination Failsafetime(min)
MedTemp‐DOE27°F(‐3°C)
MedTemp‐NSF725°F(‐4°C)
Model ProductApplication DischargeAirTemperature(AvgRefmode) ControllerSetPoint(°F) DefrostFrequency(perday) TypeofDefrost Temp.Termination Failsafetime(min)
MedTemp‐DOE27°F(‐3°C)
*MedTemp‐NSF7 25°F(‐4°C)
50
MDN4775BA/SA
MDN3575BA/SA 25°F‐27°F(‐4°Cto‐3°C)6OffTime 45°F(7°C)
50
MDN4775BA/SA
MDN3575BA/SA 6OffTime 45°F(7°C)25°F‐27°F(‐4°Cto‐3°C)
Updatethistablewiththeinfodescribed
below:
We are addingthecontrollersettingsforeach
application
20
25
30
35
40
45
50
55
MDN4775BA/SA@NSFType2Conditions‐ DischargeAirTemperature
Addthischartbelowthecontrollersettings
table.
*Factory Setting
Model ProductApplication DischargeAirTemperature(AvgRefmode) ControllerSetPoint(°F) DefrostFrequency(perday) TypeofDefrost Temp.Termination Failsafetime(min)
MedTemp‐DOE27°F(‐3°C)
MedTemp‐NSF725°F(‐4°C)
Model ProductApplication DischargeAirTemperature(AvgRefmode) ControllerSetPoint(°F) DefrostFrequency(perday) TypeofDefrost Temp.Termination Failsafetime(min)
MedTemp‐DOE27°F(‐3°C)
*MedTemp‐NSF7 25°F(‐4°C)
50
MDN4775BA/SA
MDN3575BA/SA 25°F‐27°F(‐4°Cto‐3°C)6OffTime 45°F(7°C)
50
MDN4775BA/SA
MDN3575BA/SA 6OffTime 45°F(7°C)25°F‐27°F(‐4°Cto‐3°C)
Updatethistablewiththeinfodescribed
below:
We are addingthecontrollersettingsforeach
application
20
25
30
35
40
45
50
55
MDN4775BA/SA@NSFType2Conditions‐ DischargeAirTemperature
Addthischartbelowthecontrollersettings
table.
*Factory Setting

2-4 ELECTRICAL / REFRIGERATION
P/N 9FQ-6-P110-075-00_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
CONTROLLER OPERATION
The electronic controller is located in the cas-
sette compartment. The controller comes factory
set, and is ready for use. The front grille must
be removed in order to access this control.
When removing the grille for this operation or
for condenser cleaning, care must be taken not
to damage the display interface cable. It may
be unplugged during this task.
1. Plug the merchandiser plug into its receptacle.
a. The controller display will illuminate.
b. The interior light will illuminate.
2. After the control preprogrammed time delay
of up to 6 minutes, the compressor and evap-
orator fan(s) will start if the control is calling
for cooling.
3. The control will cycle the compressor but
may also cycle evaporator fan(s) on and off
determined by the Set-Point and Differential
temperatures.
a. The Set-Point is the adjustable
preprogrammed temperature.
b. The Differential is the non-adjustable pre
programmed temperature.
c. The Control is designed to read and
display a cabinet temperature not a product
temperature.
This cabinet temperature may reect the
refrigeration cycle of the Set-Point and its’
Differential. The most accurate temperature
on a cabinets operation is to verify the product
temperature.
Main Features:
• Panel-mounted
• Energy saving algorithms and optimised
defrost control
• 8 preloaded applications
• Defrost at single / double evaporator
• Frame Heater
• Local network auto-conguration
• Direct load connection (up to 2 HP)
• Supply voltage control LVD
• Presence of an open collector output

P/N 9FQ-6-P110-075-00_B2-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
RTN400 Page 8/130
CONNECTIONS
TERMINALS
LINK2
KEYB
{
{
RS485
OPTIONAL
ELIWELL
ELIWELL
33
32
31
29
30
28
27
26
25
24
22
20
18
23
21
19
1
2
3
5
9
4
11
12
10
GND D
GND
GND
D
OC
12V
D
12V
15 16 17
34 35 36 37 38 39
A
14
13
6
8
7
OUT2 (1HP)
OUT1 (2HP)
OUT3 (8A)
OUT4 (8A)
*N.B.: analogue inputs PB1...PB5 can also be configured as Digital Inputs DI.
TERMINALS
1-2 NEUTRAL. These are power supply terminals. 15-16-17 Connection to KDEPlus or KDWPlus external
keyboard or ECPlus echo module.
3LINE. These are power supply terminals. 19-18 PB1 probe connection.
4OUT2 Shared Terminal 21-20 PB2 probe connection.
5N.O. OUT2 23-22 PB3 probe connection.
6N.C. OUT2 23-24 PB4 probe connection.
7OUT3 Shared Terminal 23-25 PB5 probe connection.
8N.C. OUT3 27-26 Digital input (DI).
9N.O. OUT3 28-29 LINK2. Connection 1 - local area network.
10 OUT1 Shared Terminal 30-31 LINK2. Connection 2 - local area network.
11 N.O. OUT1 32-33 Open Collector Output (OC).
12 Not Used ATTL Unicard/DMI/Multi Function Key connection
13 OUT4 Shared Terminal 34-35-36 RS485. Connection 1 - Supervision Gateway.
14 N.O. OUT4 37-38-39 RS485. Connection 2 - Supervision Gateway.

2-6 ELECTRICAL / REFRIGERATION
P/N 9FQ-6-P110-075-00_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
RTN400 Page 17/130
KDEPLUS BUTTONS
The KDEPlus keyboard has 4 keys, as shown in the illustration:
1
2
3
4
Each key has a different function depending on whether it is:
• Pressed and released
• Pressed for at least 5 seconds
• Pressed and held at start-up
• Pressed in combination with another key.
KEYS
The following table summarizes the function of each key:
No Key Action
Pressed and released Press for at least 5 secs Start-up
1• Scrolls through menu items
• Decreases values
Activates the Manual Defrost function
(from outside menus). ---
2• Scrolls through menu items
• Decreases values
Function can be configured by the user
(from outside menus).
(see parameter H32)
---
3
• Returns to the previous menu
level
• Confirms parameter value
Activates the Stand-by function
(from outside menus). ---
4set
• Displays any alarms
(if active)
• Opens Machine Status menu
• Confirms commands
Opens the Programming Menu
(User and Installer parameters)
When pressed during
start-up it enables
the user to select the
application to be loaded.
STANDBY or ESC
DOWN SET
UP
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area. Do NOT allow cleaning agent or
cloth to contact food product.

P/N 9FQ-6-P110-075-00_B2-7
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
RTN400 Page 21/130
SETPOINT: SETTING AND EDIT LOCK
To display the Setpoint value, press the set key to enter the “Machine Status” menu, then press the set key again when the “SEt”
label is displayed.
The Setpoint value appears on the display. To change the Setpoint value, press the and keys within 15 seconds.
Press set to confirm the modification.
set
set
set
It is possible to disable the keypad on this device.
The keypad can be locked by programming the “LOC” parameter appropriately.
With the keypad locked, you can still access the “Machine Status” menu by pressing set to display the Setpoint, but you cannot edit
it. To disable the keypad lock, repeat the locking procedure.
DISPLAY PROBES VALUE
To display the value read by probes connected to the device, press the set key and enter the “Machine Status” menu, then press
the key again when one of the probe-related labels “Pb1...Pb5” press the set key again. The value measured by the associated
probe will appear on the display.
NOTE: The displayed value is read-only and cannot be modified.
KEY-ACTIVATED FUNCTIONS
All models have the UP key set to enable the “Manual Defrost” function.
The DOWN and ESC keys can also be set to activate any other function required by the user.
The parameters for configuring the two keys are:
• H11 = DOWN key configuration
• H33 = ESC key configuration
The values that can be set apply to both keys and the functions that can be activated are:
H32/H33 value Function to enable
0 disabled
1 defrost
2 reduced set
3 Light
4 Energy saving
5 AUX
6 Stand-by
7 Deep cooling cycle
8 Start/end defrost
RTN400 Page 17/130
KDEPLUS BUTTONS
The KDEPlus keyboard has 4 keys, as shown in the illustration:
1
2
3
4
Each key has a different function depending on whether it is:
• Pressed and released
• Pressed for at least 5 seconds
• Pressed and held at start-up
• Pressed in combination with another key.
KEYS
The following table summarizes the function of each key:
No Key Action
Pressed and released Press for at least 5 secs Start-up
1• Scrolls through menu items
• Decreases values
Activates the Manual Defrost function
(from outside menus). ---
2• Scrolls through menu items
• Decreases values
Function can be configured by the user
(from outside menus).
(see parameter H32)
---
3
• Returns to the previous menu
level
• Confirms parameter value
Activates the Stand-by function
(from outside menus). ---
4set
• Displays any alarms
(if active)
• Opens Machine Status menu
• Confirms commands
Opens the Programming Menu
(User and Installer parameters)
When pressed during
start-up it enables
the user to select the
application to be loaded.
STANDBY or ESC
DOWN SET
UP
RTN400 Page 21/130
SETPOINT: SETTING AND EDIT LOCK
To display the Setpoint value, press the set key to enter the “Machine Status” menu, then press the set key again when the “SEt”
label is displayed.
The Setpoint value appears on the display. To change the Setpoint value, press the and keys within 15 seconds.
Press set to confirm the modification.
set
set
set
It is possible to disable the keypad on this device.
The keypad can be locked by programming the “LOC” parameter appropriately.
With the keypad locked, you can still access the “Machine Status” menu by pressing set to display the Setpoint, but you cannot edit
it. To disable the keypad lock, repeat the locking procedure.
DISPLAY PROBES VALUE
To display the value read by probes connected to the device, press the set key and enter the “Machine Status” menu, then press
the key again when one of the probe-related labels “Pb1...Pb5” press the set key again. The value measured by the associated
probe will appear on the display.
NOTE: The displayed value is read-only and cannot be modified.
KEY-ACTIVATED FUNCTIONS
All models have the UP key set to enable the “Manual Defrost” function.
The DOWN and ESC keys can also be set to activate any other function required by the user.
The parameters for configuring the two keys are:
• H11 = DOWN key configuration
• H33 = ESC key configuration
The values that can be set apply to both keys and the functions that can be activated are:
H32/H33 value Function to enable
0 disabled
1 defrost
2 reduced set
3 Light
4 Energy saving
5 AUX
6 Stand-by
7 Deep cooling cycle
8 Start/end defrost

2-8 ELECTRICAL / REFRIGERATION
P/N 9FQ-6-P110-075-00_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
SHELVES
Shelves should be loaded so that the product
does not extend over the front edge of the shelf.
Product loaded over the edge will interfere with
air circulation in the cabinet.
• Display items in such a way that will not
protrude from the shelf / deck pan.
• Display the items uniformly on shelf / deck
pan.
• Do not place items more than 155 lbs on
deck pan and shelf.
• After removing the items, adjust the height
and angle of the shelf.
• Adjust height and angle according to the
product.
• The shelf height can be adjusted at 0.59 inch
intervals.
• Change the angle of the shelf with the hook
as the fulcrum.
STOCKING
Product should NOT be placed inside the
merchandisers until merchandisers are at
proper operating temperature.
Allow merchandiser 24 hours to operate before
loading product.
Proper rotation of product during stocking is
necessary to prevent product loss. Always bring
the oldest product to the front and set the newest
to the back.
Air discharge and return flues must remain
open and free of obstruction at all times to
provide proper refrigeration and air curtain
performance. Do not allow product, packages,
signs, etc. to block the air inlet and air outlet.
Do not use unapproved shelving, baskets, dis-
play racks, or any accessory that could hamper air
curtain performance. Contact your Hussmann
representative for more information.
DRAIN WATER
If the evaporation mechanism is attached,
drainage work is unnecessary if the outside air
temperature is 80°F, the humidity is 55% RH,
and the ambient wind speed is less than 47.2 FPM.
During the summer and on high-humidity days,
check the overow drain pan at the bottom of
the case, and throw out any excess water (See
location illustration on Page 1-3).
RE-START
Leave the product in the case for at least 5 minutes
before re-starting the case.
If the merchandiser is re-started immediately
after stopping, the overload protection unit or a
breaker for wiring may trip, or an excessive load
may be applied to the compressor, which will
result in failure.
For energy savings:
Please turn off the lights at night and at the time
of closing the store. When night curtains are
provided, pull them down during off hours to
enhance product quality.
Do not block the discharge air outlet
and return air inlet with products.

P/N 9FQ-6-P110-075-00_B2-9
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
Before Beginning Any Service or Repair:
Use a hand-held propane leak detector (“sniffer”)
to ensure no propane is present in the immediate
area, the inside of the display case and the inside
of the refrigeration system. R-290 is an odorless
refrigerant. Keep the area clear of all customers
and non-essential or unauthorized personnel.
Verify that all repair parts are identical models
to the ones they are replacing. Do not substitute
parts such as motors, switches, relays, heaters,
compressors, power supplies or solenoids.
Failure to do so can result in an explosion,
death, injury and property damage. Parts
used on hydrocarbon cases must meet specic
UL certication for non-incendive or non-
sparking components. Use only Hussmann
approved parts approved through the Hussmann
Performance Parts Website. https://parts.
hussmann.com/
Brazing must not begin before all propane has
been cleared from the immediate area — the
inside of the displays case and the inside of the
refrigeration system.
Only Hussmann or factory
trained technicians should
service or repair this R-290
(propane) equipment.
Failure to follow
instructions can result in
an explosion, death, injury
and property damage.
If a leak is detected, follow store safety
procedures. It is the store’s responsibility to have
a written safety procedure in place. The safety
procedure must comply with all applicable codes
such as local re department’s codes.
At minimum, the following actions are required:
• Immediately evacuate all persons from the
store, and contact the local re department to
advise them that a propane leak has occurred.
• Call Hussmann and/or a qualied service
agent and inform them that a propane sensor has
detected the presence of propane.
• Do not let any persons back into the store
until the qualied service technician has arrived
and that technician advises that it is safe to
return to the store.
• The propane gas used in the unit has no odor.
The lack of smell does not indicate a lack of
escaped gas.
• A hand-held propane leak detector
(“sniffer”) should be used before any repair and/
or maintenance is attempted. All repair parts
must be identical models to the ones they are
replacing.
• No open ames, cigarettes or other possible
sources of ignition should be used inside the
building where the units are located until the
qualied service technician and/or local re
department determines that all propane has been
cleared from the area and from the refrigeration
systems.